Fiat Doblo 1.6 Diesel worn camshaft

Ask for and share advice on using the PicoScope kit to fix vehicles here.
Post Reply
ktl2019
OneWave
OneWave
Posts: 33
Joined: Fri Mar 19, 2021 3:42 pm

Fiat Doblo 1.6 Diesel worn camshaft

Post by ktl2019 »

Hello
This Fiat smokes white (unburned diesel) and jerks when accelerating.
According to the injection quantity deviation, it affects the 2nd cylinder.
Compression on all cylinders is between 20 and 21 bar. (little low but engine starts and run)
Pressure loss test on all cylinders between 5 and 10 %
When injectors 1 and 2 are swapped, the error does not move

I have now measured the intake manifold pressure with a piezo pressure sensor and the current consumption of the first cylinder with a piezo pressure sensor.

But can someone explain this waveform, how can i identify the worn camshaft of the 2. cylinder
Made this test the first time.

My english is very bad, have translated this with google translator.
Maybe one guy here also speak german and can explain it.
Attachments
Muju Fiat.jpg
Muju Fiat Doblo Saugrohrdruck + Injektor 1.psdata
(9.31 MiB) Downloaded 48 times

ktl2019
OneWave
OneWave
Posts: 33
Joined: Fri Mar 19, 2021 3:42 pm

Re: Fiat Doblo 1.6 Diesel worn camshaft

Post by ktl2019 »

I created a primitive table, hope it's correct
Attachments
Muju Arbeitsspiel.jpg
Muju Fiat Arbeitsspiel.pdf
(56.04 KiB) Downloaded 82 times
Last edited by ktl2019 on Tue Dec 12, 2023 7:07 pm, edited 1 time in total.

Littlejohn
OneWave
OneWave
Posts: 15
Joined: Thu Nov 01, 2018 4:11 pm

Re: Fiat Doblo 1.6 Diesel worn camshaft

Post by Littlejohn »

it’s a great capture.
Looking at it I am surprised you had good compression as it looks like there is no intake pull at all.
Do you have a wps to go in-cylinder?

ktl2019
OneWave
OneWave
Posts: 33
Joined: Fri Mar 19, 2021 3:42 pm

Re: Fiat Doblo 1.6 Diesel worn camshaft

Post by ktl2019 »

Dont have a WPS, but will order a PDS500G

In idle i runs fine if engine is a little be warm, but smokes white
Attachments
Kompression Fiat.jpg

Post Reply